Abstract

The transmission of infrared radiation from flames through various pathlengths of CO2 was determined in the laboratory. The results show that a considerable amount of flame energy is transmitted in the regions 2.5 μ to 3.5 μ and 4.0 μ to 5.5 μ. For example, a cell length of 1500 cm of CO2 at 760-mm pressure, equivalent to the CO2 content in 50,000 m of atmosphere at sea level, transmitted 20% of the energy in the band region from 4.0 μ to 5.5 μ. Integrated transmittances for the bands at various pressures and cell lengths are presented in tabular form.

© 1966 Optical Society of America

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References

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  1. S. S. Ballard, W. L. Wolfe, Appl. Opt. 5, 547 (1962).
    [CrossRef]
  2. R. H. Tourin, J. Opt. Soc. Am. 51, 175 (1961).
    [CrossRef]
  3. R. V. Stull, P. J. Wyatt, G. N. Plass, Appl. Opt. 3, 243 (1964).
    [CrossRef]
  4. J. N. Howard, J. S. Garing, Infrared Phys. 2, 155 (1962)
    [CrossRef]
  5. R. B. Tagirov, Opt. i Spektroskopiya 6, 137 (1959); Opt. Specty. 6, 90 (1959).
  6. K. Ångström, Ann. Phys. 6, 163 (1901).
    [CrossRef]
  7. R. W. Wood, Physical Optics (Macmillan, New York, 1934), pp. 527–528.

1964 (1)

1962 (2)

J. N. Howard, J. S. Garing, Infrared Phys. 2, 155 (1962)
[CrossRef]

S. S. Ballard, W. L. Wolfe, Appl. Opt. 5, 547 (1962).
[CrossRef]

1961 (1)

1959 (1)

R. B. Tagirov, Opt. i Spektroskopiya 6, 137 (1959); Opt. Specty. 6, 90 (1959).

1901 (1)

K. Ångström, Ann. Phys. 6, 163 (1901).
[CrossRef]

Ångström, K.

K. Ångström, Ann. Phys. 6, 163 (1901).
[CrossRef]

Ballard, S. S.

S. S. Ballard, W. L. Wolfe, Appl. Opt. 5, 547 (1962).
[CrossRef]

Garing, J. S.

J. N. Howard, J. S. Garing, Infrared Phys. 2, 155 (1962)
[CrossRef]

Howard, J. N.

J. N. Howard, J. S. Garing, Infrared Phys. 2, 155 (1962)
[CrossRef]

Plass, G. N.

Stull, R. V.

Tagirov, R. B.

R. B. Tagirov, Opt. i Spektroskopiya 6, 137 (1959); Opt. Specty. 6, 90 (1959).

Tourin, R. H.

Wolfe, W. L.

S. S. Ballard, W. L. Wolfe, Appl. Opt. 5, 547 (1962).
[CrossRef]

Wood, R. W.

R. W. Wood, Physical Optics (Macmillan, New York, 1934), pp. 527–528.

Wyatt, P. J.

Ann. Phys. (1)

K. Ångström, Ann. Phys. 6, 163 (1901).
[CrossRef]

Appl. Opt. (2)

Infrared Phys. (1)

J. N. Howard, J. S. Garing, Infrared Phys. 2, 155 (1962)
[CrossRef]

J. Opt. Soc. Am. (1)

Opt. i Spektroskopiya (1)

R. B. Tagirov, Opt. i Spektroskopiya 6, 137 (1959); Opt. Specty. 6, 90 (1959).

Other (1)

R. W. Wood, Physical Optics (Macmillan, New York, 1934), pp. 527–528.

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Figures (3)

Fig. 1
Fig. 1

Infrared flame emissions showing loss through external 190-cm optical system.

Fig. 2
Fig. 2

Infrared flame emission showing absorption by 600 cm of CO2 at various pressures.

Fig. 3
Fig. 3

Integrated flame transmittance as a function of equivalent airpath.

Tables (1)

Tables Icon

Table I Integrated Transmittances for Infrared Flame Emission at the 2.5–4.5 μ and 4.0–5.5 μ Regions Through CO2 at Various Pressures and Pathlengths

Equations (1)

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I = I 0 e - k t ,

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